Firearm.



T. c. JOHNSON. FIREARM.

APPLICATION FILED OCT. 23. WW.

1,212,773. Patented Jan. 16,1917.

THOMAS C. JOHNSON, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO WINCHESTER REPEATING ARMS (30., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

FIREARM.

Specification of Letters Patent.

Patented Jan. 16, 1917.

Application filed October 23, 1916. Serial No. 127,077.

To all whom it may concern Be it known that I, THOMAS C. JOHNSON, a citizen of the United St ates, residing at New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Firearms; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to he a full, clear, and exact description of the same, and which said drawings constitute part of this application, and represent, in

Figure l a plan view of the breech-end of a gun-barrel constructed in accordance with my invention. Fig. 2 a view thereof in rear elevation. Fig. 3 a broken view in longitudinal section, showing the gun-barrel and breech-bolt with a cartridge in position in the cartridge-chamber of the barrel with its head engaged by the cartridge-extractor which is applied to the bolt. Fig. 4 a plan view of the forward end of the bolt. Fig. 5 a view thereof in front elevation.

My invention relates to an improvement in firearms of the class using rim-cartridges as distinguished from rimless cartridges, the obj ect being to provide clearance in the gunbarrel for the cartridge-supporting abutment projecting from the forward end of the breech-bolt, without interfering with the support of the body and rim of the cartridge by the gun-barrel itself.

\Vith these ends in view, my invention consists in a firearm having certain details of construction as will be hereinafter described and pointed out in the claim.

In carrying out my invention, as herein shown, I form a segmental, concentric clearance-recess 2 in the flat rear face 3 of the threaded stem l projecting from the breechend 5 of the gun-barrel 6. The said clearance-recess 2 is separated from the cartridgechamber 7 in the breech-end 5 of the gunbarrel, by a segmental cartridge-supporting wall 8 as best shown in Fig. 2. Under this construction, the provision of the gun-barrel Copies of this patent may be obtained for five cents each,

6 with the clearance-recess 2, does not impair the support afforded the cartridge by the walls of the cartridge-chamber 7. The said clearance-recess 2 receives the beveled forward end of a cartridge-retaining abutment- 9- projecting from the forward end of the breech-bolt l0 and co-acting inthe usual manner with the cartridge-extractor 11 which is applied to the bolt and which enters a clearance-cut 12 in the face 3 aforesaid.

lVhe-n the gun is closed with a rim-cartridge 13 in the cartridge-chamber 7 the cartridge-retaining abutment 9 enters the clearance-recess 2, the segmental form of which permits the abutment to move in the recess as the bolt is being rotated a quarter turn for locking and unlocking. hen the breech-bolt is unlocked and retracted for the extraction of the spent cartridge, the abutment 9 supports the cartridge through the rim thereof, against the thrust in the opposite direction of the extractor 11, throughout the extracting operation. The recess 2 thus provides for the clearance of the abutment 9, while the wall 8 preserves the integrity of the outer edge of the cartridge-chamber 7.

I claim In a firearm, the combination with a breech-bolt adapted to be rotated for looking and unlocking it, and provided with a forwardly projecting cartridge-retaining abutment, of a gun-barrel formed with a segmental clearance-recess for the reception and rotary movement of the said abutment, the said recess being separated from the rear portion of the cartridge-chamber in the gunharrel by a cartridge-supporting wall, and a cartridge-extractor co-acting with the said abutment in the extraction of the spent-cartridges.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

THOMAS C. JOHNSON.

\Vitnesses FRANK F. BURTON, FRANK A. PAUL.

by addressing the Commissioner of Patents,

Washington, D. 0. 

